2005401261 has 8 divisors (see below), whose sum is σ = 2688806880. Its totient is φ = 1329464912.

The previous prime is 2005401259. The next prime is 2005401269. The reversal of 2005401261 is 1621045002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2005401261 - 2¹ = 2005401259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005401269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1866690 + ... + 1867763.

It is an arithmetic number, because the mean of its divisors is an integer number (336100860).

Almost surely, 2^2005401261 is an apocalyptic number.

It is an amenable number.

2005401261 is a deficient number, since it is larger than the sum of its proper divisors (683405619).

2005401261 is a wasteful number, since it uses less digits than its factorization.

2005401261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734635.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2005401261 is about 44781.7067673844. The cubic root of 2005401261 is about 1261.0542241496.

Adding to 2005401261 its reverse (1621045002), we get a palindrome (3626446263).

The spelling of 2005401261 in words is "two billion, five million, four hundred one thousand, two hundred sixty-one".